US2025210658A1PendingUtilityA1
Lithium Secondary Battery
Est. expiryDec 22, 2043(~17.4 yrs left)· nominal 20-yr term from priority
Y02E60/10H01M 2220/20H01M 2004/021H01M 2004/027H01M 4/131H01M 4/366H01M 4/505H01M 4/525H01M 4/625H01M 10/0525H01M 4/133H01M 4/587H01M 2010/4292H01M 4/624H01M 4/364H01M 4/13H01M 10/052B60L 50/64H01M 2004/028
69
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Claims
Abstract
Provided is a lithium secondary battery including a negative electrode including a negative electrode composite layer including a negative electrode active material including a first negative electrode active material and a second negative electrode active material, a negative electrode conductive material, and a negative electrode binder; a positive electrode including a positive electrode composite layer including a positive electrode active material, a positive electrode conductive material, and a positive electrode binder; and an electrolyte, and CFC defined by Equation 1 is 0.38 to 1.962: CFC =100× W c −{( D 50,a1 ×D 50,a2 ×L×R N/P ×10 10 )/ MW c } Equation 1: wherein in Equation 1, all the variables are described herein.
Claims
exact text as granted — not AI-modifiedWhat is claimed is:
1 . A lithium secondary battery comprising:
a negative electrode comprising a negative electrode composite layer comprising a negative electrode active material comprising a first negative electrode active material and a second negative electrode active material, a negative electrode conductive material, and a negative electrode binder; a positive electrode comprising a positive electrode composite layer comprising a positive electrode active material, a positive electrode conductive material, and a positive electrode binder; and an electrolyte, wherein the lithium secondary battery has a CFC defined by Equation 1 of 0.38 to 1.962,
CFC
=
100
×
W
c
-
{
(
D
50
,
a
1
×
D
50
,
a
2
×
L
×
R
N
/
P
×
10
10
)
/
MW
C
}
Equation
1
wherein in Equation 1, W c is a weight ratio of the negative electrode conductive material with respect to a total weight of the negative electrode composite layer, MW c is a weight value of 1 mole of carbon measured in grams, D 50, a1 is a D 50 value of the first negative electrode active material measured in meters, D 50, a2 is a D 50 value of the second negative electrode active material measured in meters, L is a weight value of the negative electrode active material per unit area of the negative electrode composite layer disposed on one side of the negative electrode, measured in g/25 cm 2 , and R N/P is a capacity ratio of the negative electrode to the positive electrode.
2 . The lithium secondary battery of claim 1 , wherein the first negative electrode active material and the second negative electrode active material are each independently a graphite-based material.
3 . The lithium secondary battery of claim 1 , wherein the first negative electrode active material is artificial graphite, and
the second negative electrode active material is natural graphite.
4 . The lithium secondary battery of claim 1 , wherein the first negative electrode active material and the second negative electrode active material are included in a weight ratio of 90:10 to 50:50.
5 . The lithium secondary battery of claim 1 , wherein the negative electrode conductive material is a point-type conductive material.
6 . The lithium secondary battery of claim 1 , wherein W c in Equation 1 is 0.001 to 0.05.
7 . The lithium secondary battery of claim 1 , wherein the first negative electrode active material has a D 50 of 10 μm to 30 μm, and
the second negative electrode active material has a D 50 of 5 μm to 25 μm.
8 . The lithium secondary battery of claim 1 , wherein L in Equation 1 is 0.2 to 0.5.
9 . The lithium secondary battery of claim 1 , wherein R N/P in Equation 1 is 1.05 to 1.10.
10 . The lithium secondary battery of claim 1 , wherein the positive electrode active material comprises a single particle type lithium nickel-based oxide having a Ni content of 70 mol % or less.
11 . The lithium secondary battery of claim 10 , wherein the single particle type lithium nickel-based oxide is included in an amount of at least 50 wt %, based on a total weight of the positive electrode active material.
12 . The lithium secondary battery of claim 10 , wherein the single particle type lithium nickel-based oxide comprises 1 to 25 nodules, and
the nodules have an average particle size of 0.8 μm to 4.0 μm.
13 . The lithium secondary battery of claim 10 , wherein the single particle type lithium nickel-based oxide is represented by Formula 1:
Li 1+x [Ni a CO b Mn c M 1 d ]O 2 [Formula 1]
wherein in Formula 1, M 1 comprises at least one element of Ti, Mg, Al, Zr, Y, Ba, Ca, Sr, W, Ta, Nb, or Mo, and −0.1≤x≤0.1, 0.5≤a≤0.7, 0<b<0.5, 0<c<0.5, and 0≤d≤0.2.
14 . The lithium secondary battery of claim 10 , wherein the single particle type lithium nickel-based oxide further comprises a coating layer containing at least one element of Ti, Mg, Al, Zr, Y, Ba, Ca, Sr, W, Ta, Nb, or Mo, on a surface thereof.
15 . The lithium secondary battery of claim 1 , wherein the positive electrode active material has a D 50 of 3.0 μm to 8.0 μm.
16 . The lithium secondary battery of claim 1 , wherein the positive electrode conductive material comprises a line-type conductive material and a point-type conductive material.
17 . The lithium secondary battery of claim 1 , which has an energy density of 260 Wh/kg or greater.
18 . The lithium secondary battery of claim 1 , which has a charge cut-off voltage of 4.35 V or greater.
19 . A battery module comprising the lithium secondary battery of claim 1 .
20 . An electrical vehicle comprising the battery module of claim 19 as a power source.Join the waitlist — get patent alerts
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